Imported model has odd wireframe color
In Edit Mode, Select all - A, press CTRL+E > Clear Sharp. 

They are Marked Sharp and this is why it looks like this. It happens sometimes when importing .OBJ files or other formats.



You can also check Data tab > Geometry Data for Custom Normals, they can cause troubles but they can also be good. So if want to get rid of them choose Clear Custom Split Normals Data.